Quick view VMP Performance VMP Performance 2020+ Shelby Ford Shelby GT500 5.2L 10 Percent Overdrive 8-Rib Balancer Kit - VMP-10OD52KIT Compare $1,099.99 The entry level 10% OD kit adds 2 pounds of boost and includes the minimum parts necessary to complete the installation.? For the ultimate in performance add our VMP heavy duty belt tensioner (included with 20% and 30% OD kits).This Part... Add to Cart Add to Cart